Eldorado V8-4.6L VIN Y (1994)
Ignition Control
PURPOSE
The ICM performs several functions:
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It monitors the "ON-OFF" pulses produced by the two crankshaft and one camshaft position sensors.
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It creates a 4X and 24X reference signal (4X REF HI and 24X CRANK) sent to the PCM for ignition control.
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It creates a camshaft reference signal (1/2X CAM HI) sent to the PCM for fuel injection control.
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It provides a ground reference (REF LO/CAM LO) to the PCM.
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It provides a means for the PCM to control spark advance (BYPASS and IGNITION CONTROL) called IGNITION CONTROL MODE.
